Calum made his screen debut at the age of 9, guest starring in Fox's Night Visions (directed by Bill Pullman). At the age of 10 he starred in the BBC 6 episode mini-series I Was a Rat. He has since completed more than 50 different film and TV projects, and has worked in five different countries – Canada, USA, Australia, England, and Singapore. He was nominated for and won Two Young Artist Awards for "Leading Young Actor" roles in 2004 and 2010, as well as being nominated for another "Young Artist Award" "Leading Young Actor" role in 2006. He also won a Leo Award (Canada) in 2010 for “Leading Actor”.
Calum currently resides in Los Angeles, California  and is cast as a series regular on the Disney series Austin and Ally. The name of his character is Dez, who is portrayed as extremely goofy video director and Austin Moon's best friend.